The development of shape-stabilized composite phase change materials (PCMs) is critical for realization of efficient thermal energy management systems and sustainable energy utilization. Herein, we designed an intelligent, multifunctional, organic composite PCMs with a three-dimensional (3D) hybrid nanocomposite and n-pentadecane. The 3D hybrid material was designed via integration of exfoliated graphene nanoplatelets (xGnP) and multiwalled carbon nanotubes (CNTs). The hybrid nanocomposite exploited the distinctive attributes and synergistic effect of each the supporting component for the well-designed composite PCMs to demonstrate high physical and thermochemical responses. The obtained composite PCM presented a high loading ratio of 82.7% and latent heat of 150.9 ± 0.9 J/g (which is 36% higher than that of the pristine xGnP-supported PCMs) owing to favorable space availability for phase change transformation with the aid of the CNTs skeleton. Moreover, the composite exhibited reduced supercooling (56.6% lower than that of CNTs-supported n-alkane), high leakage resistance capability, and thermal stability performance. The composite PCMs can also enable realization of a thermoelectric conversion system (lower than 10¹ Ω m resistivity, which is a reduction of more than six orders of magnitude compared with pristine n-alkane) and exhibit high thermal diffusivity (up to 3.707 mm²/s), indicating several practical applications thereof.

形状稳定的复合相变材料（PCM）的开发对于实现有效的热能管理系统和可持续的能源利用至关重要。在这里，我们设计了一种智能的，多功能的有机复合材料PCM，它具有三维（3D）杂化纳米复合材料和正十五烷。通过剥离石墨烯纳米片（xGnP）和多壁碳纳米管（CNT）的集成来设计3D杂化材料。杂化的纳米复合材料利用精心设计的复合材料PCM的每个支撑成分的独特属性和协同效应，表现出较高的物理和热化学响应。所得复合材料PCM具有82.7％的高负载率和150.9±0的潜热。9 J / g（比原始的xGnP支持的PCM高36 J / g），这是因为在CNTs骨架的帮助下可用于相变转换的空间利用率很高。此外，该复合材料表现出降低的过冷度（比CNTs负载的正构烷烃降低了56.6％），高抗渗能力和热稳定性能。复合PCM还可以实现热电转换系统（低于10^1层 Ω米的电阻率，这是一个降低幅度超过六个数量与原始相比Ñ烷烃）和表现出高的热扩散率（高达3.707毫米² / s）的，指示其几个实际应用。